The oblique detonation engine （ODE） utilizes standing oblique detonation wave （ODW） to efficiently convert the chemical energy of fuel into mechanical energy in hypersonic flow， greatly improving the upper limit of the air-breathing flight regime， which holds significant development potential and practical value. This paper provides an overview of the development of ODE in the early， middle， and recent stages. Then， the current research status on oblique detonation combustion and engines are summarized. Furthermore， the progress made worldwide in three areas， oblique detonation combustion organization， fuel injection mixing， and overall performance with internal flow design， are reviewed from the perspective of engine design. Finally， the technique challenges and future key focus directions in five aspects， including integrated design of internal and external flow under overall constraints， fuel injection and mixing in hypersonic flow， stable combustion organization under complex inflow conditions， high thermal load protection， and experimental conditions under ultra-high speed conditions are analyzed， aiming to provide reference for future in-depth technological breakthroughs and applications.